General: Various supporting classes when using AwsCredentials are not serializable #1112

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• Search the issues already opened: https://github.com/googleapis/google-auth-library-java/issues
• Check for answers on StackOverflow: http://stackoverflow.com/questions/tagged/google-cloud-platform

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Environment details

1. Specify the API at the beginning of the title. For example, "BigQuery: ...").
   General, Core, and Other are also allowed as types
2. OS type and version: Mac OS Venture (13.0.1)
3. Java version: 11
4. version(s): main

Steps to reproduce

1. Using the Flink PubSub connector (patched with the latest version of this library), when passing using external account impersonation to AWS, various classes are unable to be serialized / deserialized by Flink (although this would be true of other runtimes that engage in class serialization, eg Spark, Beam, etc.).

Code example

// example

Stack trace

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External references such as API reference guides

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